Hi there Albert,
Thanks for you interest in our plugins 🙂
I want to be able to list both internal and external activities on my events calendar.
This is possible by creating categories for internal and external events. You can even use Category Colors plugin to visually distinguish them.
I would like the board of directors to get notifications in email form when an event is upcoming.
Unfortunately this is not possible 🙁 There’s a third party plugin which let’s you create newsletters including your upcoming events that might help: Event Calendar Newsletter.
And I would like to allow only the board of directors to have access to the internal events.
You can password protect events like you would do for regular WordPress posts. If you don’t want the events to show at all for other users then the way to go would be to create a custom script to hide internal event category for non-logged in users or for a certain user role. If you decide to purchase the plugin we can assist you on this via the support forums.
Please let me know if this answers your questions,
Best,
Nico